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Plant families that participate in intracellular endosymbiosis (A) and the evolution of mutualistic symbiotic associations: a possible scenario (B) (modified from Martin et al., 2017 [20]); a, arbuscular mycorrhiza-like and/or mucoromycotina associations; b, arbuscular mycorrhiza; c, ectomycorrhiza; d, arbuscular mycorrhiza; e, Frankia N-fixing; f, Rhizobial N-fixing.
